A Java biquadratic filter designer. BiQuadDesigner can create biquadratic filters. Present-day software-based filtering methods have their roots in older analog electronic designs, and filter design represents just one example of a fundamental change in electronic technology, a technology that began with analog designs, moved to integrated-circuit-based digital equivalents, and has finally arrived at pure algorithm-based designs.

Another way to say it: filters were once conceived using mathematical equations and then realized in analog circuits, but at present, the mathematical equation is the filter, riting an appropriate equation begins and ends the process in one step, in some cases even if that equation has no closed-form solution.

Requirements:
* Java

The license of this software is Free, you can free download and free use this calculator software.